kernel-2.6.27.9-159.fc10.i686 headphone problem.

[Adrin Jalali]

hi everybody.
When I start my inspiron 6400 laptop with kernel-2.6.27.9-159.fc10.i686,
inserting headphone into it's port will disable laptop speaker but it does
not make sound go through the headphone and my headphone will remain
silent!!!
Any idea? It was working well with previous kernels.
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